Rotary drill.



No. 721,037. PAYTLNTLD PEB. .17, y1905;

0. H. HALSBLBR LA. H. TAYLOR.

ROTARY DRILL. L

APPLICATION FILED JUE 18, 1901. BENBWED DEO. 19, 1902.

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. N ROTARY DRILL. APPLIoAToN FILED mim 1a, 1901. LENBWBD DB0. 19, 19'02.

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10.721,037. PATRNTRDPRB.17,1903.

' (AH. HARSRLRRR A. H. TAYLOR.

ROTARY DRILL.

APPLICATION IILEDJUNE 18, 1901. RENBWED DO. 19, 1902.

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UNITED STATES PATENT OEETCE. i

CHARLES HERMAN IIAESELER AND ALBERT H. TAYLOR, OF PHILADELPHIA,

` PENNSYLVANIA.

ROTARY DRILL.

SPECIFICATIONformng part of Letters Patent No. 721,037, dated February 17, 1903. V 1 Application filed June 18, 1901. Renewed December 19, 1902. Serial No. 135,947. (No model.)

To @ZZ whom t may concern: j

Be it known that we, CHARLES HERMAN HAESELER and ALBERT H. TAYLOR, citizens of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Rotary Drills; and

'we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to an improvement in rotary drills; and the object of our invention is to produce a device of this character which will be light,fshall comprise few parts, i

and will be simple and effective in operation.

With this object inview our invention consists in the construction and combinations of parts, as hereinafter described and claimed.

In the accompanying drawings, Figure lis a vertical longitudinal section of our device. Fig. 2 is a cross-section on the line 2 2 of Fig. 1. Fig. 3 is a cross-section on the line 3 3 of Fig. 1. Fig. 4 is a section on the line 4 4 of Fig. 1. Fig. 5 is an elevation, partly in section, of the valve-containing cylinder. Fig. 6 is a view of the same in a diiferent position, and Fig. 7 is a perspective view of the valve.

The casing of the drill is composed of an upper part a and a lower part b, fastened thereto by screws c d; In the lower casing are air-ports c f for the-escape of air or other motor iuid which is used to run the drill, or the lower part of the casing may be of openscrew-threaded at Z. This projection lc is perforated for the passageof the valve-cylinder.

m represents a bolt screwed into the part 7c for the purpose of confining the cylinder 69, hereinafter to be described.

" ring is also perforated at one side of its center for the reception of the valve-cylinder.

i Around the ring u is a circular Wear-plate t, L-shaped in cross-section, on which are supported antifriction-balls u, upon which balls rests anotherV circular stepped wear-plate s. The wear-plate s is secured in the ring r.

Iw represents a spider-arm (there preferably being three of these) attached to or made integral with the ring r and provided with a downwardly-projecting thimble at its outer end. This thimble is perforated for the reception of a hollow sleeve y, which is surrounded by a hardened wear-sleeve z, which sleeve is in turn surrounded by an extended sleeve 73, carried on the piston-rod 40. The sleeve y is secured in position by the bolt 2, which passes through `the extension 1 of the crankarm 3. This crank-arm terminates in a head 5, perforated and screw-threaded, and in this head 5 by means of the screw 4 is fastened the gear-wheel 6, which is arranged centrally of the drill immediately under the handle and immediately over the tool. This central gear-wheel 6 meshes with gear-wheels 7 and 8, (see Fig. 1;) but preferably three of these gearwheels are used. T hese gearwheels are mounted upon pins 9 and 10, having reduced lower portions 11 and 12, the upper part of the pins being surrounded-by hardened wear-sleeves 13 and 14. These provided with a double-threaded extension 20, with which the circular nuts 21 and 22 engage.

23 and 24 represent circular hardened wearplates, the two together providing a channel for the reception of the antifriction-balls 25.

26 represents the tool-holder, bored out at 27 for the reception of a drill or other tool and provided with an opening 28 for the reception of a cotter or pin. This tool-holder is confined in the cylinder 18 by means of the nut 21 and the pin 29. The valve-cylinder is best shown in Figs. and 6. It is provided with an enlarged portion 30, which has a holderbore 58 and a screw-threaded lower opening 55, an inlet-port 75, an exhaust-port 76, a perforation 56 for the reception of a securingpin, a shoulder 57, a smaller internal bore 59, ports 60 for the admission of air, and a plate 63, preferably of hardened metal, on which is supported a gear-wheel 61, fastened to the top of the valve-cylinder by the screw 62.

The valve is shown in perspective in Fig. 7. It consists of a rectangular plate 50, provided with a concave upper portion 51, a circular portion 52, and a fiat portion 53. A hole 54 is made in the circular portion 52 for the reception ofa secu ring-pin which passes through the hole 56in the valve casing or cylinder. We preferably use three cylinders 34, 35, and 36, one hundred and twenty degrees apart. These are all cast solid around a centralsupport 3l, triangular in cross-section, which is perforated centrally for the passage of the valve cylinder or casing 30. This support 31 is provided with three admission-ports 46, 47, and 48, one for each cylinder, and an equal number of exhaust-ports, one of which, 49, is shown in Fig. 1. These cylinders, With their central support, are held in place on the valve cylinder or casing by a perforated washer 32, beveled, as shown in Fig. 1, which washer is secured to the valve-casing by a hollow nut 33. In the cylinders 34, 35, and 36 are pistons 37, 38, and 39. These pistons are pivoted, by means of the pivots 43, 44, and 45, to piston rods or arms 40, 41, andr42. These pis; ton-rods at their outer ends are pivoted to extended sleeves, one instance being shown in Fig. 1, Where the arm 40 is provided with a sleeve 73, which is pivoted on the sleeve y, there being an interposed wear-piece a.

Mounted on top of the casing is mechanism for stopping, starting, and reversing the drill. The cylinder 64 is screw-threaded upon the extension 7c. This cylinder is reduced to form a smaller cylinder 66 at its top, screwthreaded at 65.

67 represents the reversing-handle, which is secured by a pin 72 to a sleeve 68, which is provided with a hollow passage 71 for the admission of oil to the machine. The sleeve 68 is enlarged, forming a cylinder 69, which lits within the cylinder 64 and is partially confined in place by the bolt m. The cylinder 69 is provided with internal gear-teeth 70, extending about half-way around the cylinder. These gear-teeth mesh with the gearwheel 61 on the valve-cylinder 30.

In the normal position, as shown in Figs. l and 4, the valve-cylinder is in such a position that there is a clear passage for the air through the pipe q to the interior of the cylinders. Bymoving the handle in either direction fortyiive degrees the passages 60 in the valve-cylinder no longer communicate with the passage in the pipe q, the supply of air to the cylinder is cut o, and the drill is stopped. If then it is turned forty-ve degrees more, the motion of the drill is reversed, this action being useful in withdrawing the drill from its work.

The operation is as follows: When the handle 67 is in the position shown in Fig. 1, air is admitted through the pipe n, tube q, and valve cylinder behind the two pistons 37 and 39, as shown in Fig. 3. This causes the pistons to move outwardly, rotating the gear 6, which in turn rotates the gears 7 and 8 and by means of the stationary rack 74 causes all the cylinders, with their pistons and connec-l tions, including the tool-holder, to rotate. At the time when air is being admitted to the two cylinders 34 and 35 it is being exhausted from the cylinder 36 through the air-ports 49 and 76. Thus it will be seen that air is admitted to two of the cylinders at once, which gives great power to the machine. The operation of the machine is very rapid, the revolutions being as high as two thousand per minute in some instances.

It is understood that many changes might be made without departing from the spirit of our invention, and we wish it to be expressly understood that we Ydo not limit ourselves to the exact details shown and described.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a rotary drill, the combination of a central perforated support and cylinders cast integral therewith, a spider-ring, crank-arms, connections between said ring and arms, pistons in said cylinders, piston-rods pivotally connected to said connections and said pistons, and means for admitting, cutting off and changing the direction of the motor iiuid admitted to said cylinders, said meansincluding a handle for supporting the drill.

2. In a rotary drill, the combination of a series of cylinders, pistons in said cylinders, piston-rods pivotally connected to said pistons, a valve-cylinder communicating with said cylinders, a valve in said cylinder, and means for turning said valve-cylinder, whereby the workman may stop, start and Vreverse the movement of said pistons.

3. In a rotary drill, the combination ofa casing provided with an internal gear, crankarms, gearing between said crank-arms and said internal gear, a spider-ring, connections between said arms and ring, a plurality of cylinders and pistons, piston-,rods pivotally connected to said connections and said pis- ICO tous, and means for governing the entrance and discharge of the motor iiuid to and from said cylinders. p

4. In a rotary drill, the combination of a casing made in two parts, one of said parts being provided with a cylindrical extension andnhaving an internal gear, crank-arms, gearing'between said internal gear and said crank-arms, a spider-ring,connections between said crankarms and spider-ring, a plurality of cylinders, pistons in said cylinders, piston-rods pivotally connected to said connections and to said pistons, and a spider-frame having a cylindrical extension. y

5. In a rotary drill, the combination of a casing, a valve-cylinder open at one end supported on said casing, a perforated support revolubly mounted 0n said valve-cylinder, a

plurality of operating-cylinders provided with inlet and outlet ports cast integral with said support, said support having a beveled end, a beveled Washer engaging said end, and a perforated nut securing said valve-cylinder, washer and support together.

6. In a rotary drill, the combination of a casing, a valve-cylinder closed at one end and` open at the other and provided with inlet and outlet openings mounted in said casing, a perforated central support, a plurality of cylinders each provided with inlet and outlet ports and made integral with said central support, a perforated nut and washer for securing said valve-cylinder and said support together, and a valve in said valve-cylinder having a portion entirely filling the bore of said cylinder, said portion being located between the inlet and outlet ports of the operating-cylinders.

7. In a rotarydrill, the combination of acasing, a valve-cylinder supported in said casing, a handle su pported by said casing, said handle and said valve-cylinder being provided with connecting-gear, whereby by turning the handle the flow of the motor fluid in said valvecylinder may be regulated. y

` 8. In a rotary drill, the combination of a casing havinga perforated extension, a valve cylinder located in the perforation in said casing and provided with a supporting-plate resting on said extension and a gear-wheel mounted above said su pporting-plate, a regulating-cylinder provided with internal gear-teeth meshing with gear-wheels on said valve-cylinder, and a handle connected to said regulating-cylinder, whereby the [low of motor iluid in said valve-cylinder may be regulated or stopped altogether. i

9. In a rotary drill, the `combination `of a valve-cylinder provided with a gear-Wheel, a regulating cylinder having internal teeth meshing with the teeth of said gear-wheel and a handle connected to said regulating-cylinder, the parts being so arranged that when the gear-wheel on the valve-cylinder is located centrally in respect-to the gear-teeth on the regulating-cylinder, a movement of the handle in either direction will cut o` the motor fluid from said valve-cylinder, and a further movement in the same direction will reverse the movements of the parts operated by the motor fluid.

10. In a rotary drill, the combination of a casing provided with a perforated extension, a perforated valve-cylinder having a closed upper end and a gear-wheel attached to said end located in said extension, a screw-threaded cylinder screwed upon the extension of said casing, a regulating-cylinder provided `with internal gear-teeth located in said screwthreaded cylinder, and a handle attached to said regulating-cylinder.

1l. In a rotary drill, the combination of a casing havin ga perforated extension, a screwthreaded cylinder composed of two cylinders of dierent sizes placed end to end, the larger of said cylinders being secured to the extension on the casing, a regulating-cylinder composed of two cylinders placed end to end and having gear-teeth in the larger of said cylinnders, and a handle fastened tothe smaller Apart of the regulating-cylinder.

ICO

internal teeth secured within `said screwthreaded cylinder, a bolt engaging one side of said regulating-cylinder, a handle Secured to said regulating-cylinder, and a valve-cylinder having a gear-wheel engaging the teeth in said regulating-cylinder.

14. In a rotary drill, the combination with a casing provided with a perforated extension, a screw-threaded cylinder fastened to said extension, a regulating-cylinder provided with internal teeth within said screw-threaded cylinder, a bolt screwed into said extension and engaging one side of said regulating-cylinder, a handle secured to said regulating-cylinder, a valve-cylinder closed at one end passing through the perforation in said extension, said valve-cylinder being provided with a plate resting upon said extension, and a gear-wheel fastened to the upper endof said valve-cylinder and engaging the teeth on said regulating-cylinder.

l5. In a rotary drill, the combination of a casing provided with a perforated extension, a securing-cylinder screwed to said extension and provided at one end withan extension forming a smaller cylinder, a regulating-cylinder provided with internal teeth and composed of two cylinders placed end to end, a handle secured to the smaller part of the regu lating-cylinder which is open fromtop to bottom and a valve-cylinder closed at one end IIO and having a gear-wheel fastened to the closed end thereof which gear-wheel engages with the internal teeth on the regulating-cylinder.

16. In a rotary drill, the combination with a casing provided with a perforated eXtension, a securing-cylindenscrewed on said extension and terminating in a smaller cylinder both parts being open from end to end, a regulating-cylinder provided with internal teeth and composed of two cylinders of dilerent sizes placed end to end located within said securing-cylinder, said regulating-cylinder being open from one end to the other, a handle secured to said regulating-cylinder, a bolt screwed into the extension on the casing and engaging one side of said regulating-cylinder, and a valve-cylinder passing through the extension on the casing and havinga closed upper end with a gear-wheel attached thereto.

17. In a rotary drill, the combination of a casing provided with a perforated extension, a perforated Vvalve-cylinder secured in said extension, said valve-cylinder being provided with a central bore closed at one end with a gear-wheel fastened to said closed end and with inlet and outlet ports, a regulating-cylinder provided with internal gear-teeth meshing with the teeth on the gear-wheel of said valve-cylinder, a handle attached to said regulating-cylinder, operating-cylinders provided with inlet and outlet ports adapted to communicate with the bore in said valve-cylinder, the parts being so arranged that when the teeth on said gear-wheel are centrally arranged in relation to the teeth on the regulating-cylinder, a movement of the handle in either direction will first decrease the liow of the motor fluid in said valve-cylinder, then out it ol and then reverse the iow thereof in said operating-cylinder.

18. In a rotary drill, the combination of a casing, a supporting-ring secured to said casing, said ring being eccentricallyperforated, a valve-cylinder located in the perforation in said ring, a plurality of cylinders revolubly supported on said valve-cylinder, crank-arms, a spider-ring revolubiysupported on said supporting-ring, connections between said crankarms and spider-ring, pistons in said cylinders, piston-rods pivotally connected to saidl tons, and means for turning said valve-cylinder, to stop or reverse the drill.

20. In a rotary drill, the combination of a casing, a supporting-ring eccentrically perforated secured to said casing, a valve-cylinder closed at one end and open at the other passing through the perforation in said supporting-ring, a spider-ring revolubly mounted on said supporting-ring, antifriction devices between said spider-ring and said supportingring, a plurality of cylinders supported on said valve-cylinder, pistons in said cylinders, crank-arms, connections between said crankarms and said spider-ring, piston-rods pivotally connected to said connections and to said pistons, and a handle for supporting the drill and for rotating said valve-cylinder, whereby the motion of the pistons in said cylinders may be stopped, started or reversed at will.

2l. In a rotary drill, the combination of a casing provided with internal gear, a spiderframe provided with gearing meshing with said internal gear, a tool-holder secured to said spider-frame, crank-arms, gearing thereon, a spider-ring, connections between said spider-ring and said crank-arms, a plurality of revolving cylinders, pistons in said cylinders, piston-rods pivotally connected to said connections and to said pistons, and means for regulating the How of the motor fluid to said cylinders.

22. In a rotary drill, a casing made in two parts secured together by bolts, one part of i said casing being provided with an` openended cylindrical extension and with openings for the escape of the motor fluid, the opposite part of said casing being provided with an opening for the admission of the motor iuid, said opening being provided with screwthreads and with a shoulder, and said upper part being provided with a perforated screwthreaded extension.

23. In a rotary drill, the combination of a casing provided with an inlet-opening, a supporting-ring secured to said casing, said supporting-ring being eccentrically perforated for the passage of the valve-cylinder and being provided with a passage at right angles to said eccentric perforation, a pipe connected with said passage, thimbles secured to one end of said pipe, a revoluble valve-cylinder mounted in the eccentric perforation of said supporting-ring, and operating means for the tool consisting of pistons, cylinders and gearing supported on said supporting-ring.

24. In a rotary drill, the combination of a casing provided with an internal gear, a spider-frame provided with a cylindrical extension, a tool-holder mounted in said extension, gearing including a central gear-wheel and connecting gear-wheels between said central gear-wheel and the gearing on said casing, crank-arms attached to said central gearwheel, extensions carried by said crank-arms, operating-cylinders, pistons in said cylinders, and piston-rods pivoted to the extensions on the crank-arms and to said pistons.

25. In a rotary drill, the combination of a casing consisting of two parts connected to- I CC" IIO IZO

gether, one part of the casing being provided with exit-openings, and the opposite part of the casing being provided with an inlet-opening having screw-threads and a shoulder, an inlet-pipe screwed into said linlet-opening, a pipe in said casing for conducting the motor iluid, a thimble engaging the lower end of said pipe, a hollow nut screwedinto said thimble and engaging the shoulder on the inletopening of said casing, a perforated ring in which the other end of said pipe engages, a perforated valve-cylinder closed at one end mounted in said ring, and operating parts driven by the motor fluid passing through the parts above mentioned.

26. In a rotary drill, the combination of a casing having an internal gear, a perforated supporting-ring secured to said casing, a perforated rotatable valve-cylinder located in said perforated ring, means for rotating said valve-cylinder to stop, start and reverse the machine, vcylinders operated on said valvecylinder, pistons in said cylinders, a spiderframe, a tool-holder mounted therein, and connections and gearing between said pistons and said spider-frame. y

27. In a rotary drill, the combination of a valve-cylinder and a valve therein, said valvecylinder being. closed at one end and open at the other, provided with inlet-ports and eX- haust-ports at different levels, and said valve being composed of a rectangular portion having a concaved upper end and a circular por.

tion fitting in the bore of said valve-cylinder, said valve being secured in said valve-cylinder so that the circular portion is located be tween the inlet and outlet ports, operatingcylinders revolubly mounted on said valvecylinder, and connections whereby the movement of the pistons operates the tool.

28. In a rotary drill, the combination of a casing, a supporting-ring secured to said casing and provided with an eccentric `perforation, a valve-cylinder passing through said perforation, means for rotating said valvecylinder, a valve located in said valve-cylinder, a support provided with cylinders made integral therewith mounted on said valve-cylinder, means for securing said support and cylinders to said valve-cylinder, a spider-ring mounted on said supporting ring, crankarms, connections between said crank-arms and spider-rin g, pistons in said cylinders, piston-rods pivotally connected to said connections and to said pistons, a spider-frame provided with a tool-holder, and gearing between said spider-frame and said crank-arms.

29. In a rotary drill, the combination of a casing provided with an internal gear, a supporting-ring secured to said casing and provided with an eccentric perforation, a valvecylinder in said perforatiommeans for rotating said valve-cylinder, a valve in said valve-` cylinder, a support having three cylinders cast integral therewith, means for mounting said support upon said valve-cylinder, a spider-ring movably supported on said sup-` `inlet and outlet openings, a supporting-ring secured to said casing, said ring having an eccentric perforation, a valve-cylinder passing through said perforation, means for rotating said valve-cylinder, a valve in said valvecylinder, an integral structure composed of the central support and radial cylinders all made in one piece, means for supporting said structure on said valve-cylinder, a spider-ring revolubly mounted on said supporting-ring, crank-arms, connections between said ring and arms, pistons in said operating-cylinders, piston-rods pivotally connected to said connections and said pistons, a spider-frame provided with a tool-holder and gearing, whereby said crank-arms drive said spider-frame and tool-holder.

3l. In a rotary drill, the combination of a casing provided with internal gear and inlet and outlet openings, a supporting-ring provided with an eccentric perforation secured to said casing, a valve-cylinder passing through said perforation, a valve in said cylinder, a structure consisting of a central perforated support and three radial operating-cylinders revolubly mounted upon said valve-cylinder, means for securing said structure upon said valve-cylinder, a spider-rin g revol ubly mounted upon said supporting-ring, crank-arms, connections between said spiderring and crank-arms, pistons in said operating-cylinders, piston-rods pivotally connected to said connections and to said pistons, a spiderframe provided with a tool-holder and plane- IOC IIO

tary gearing mounted on said spider-frame and engaging with the internal gear on said casing.

32. In a rotary drill, the combination of a casing made in two parts and provided with inlet and outlet openings, one part of said casing being provided with a cylindrical extension, a supporting-ring secured to said casing and provided with an eccentric perforation; a valve-cylinder closed at one end and mounted in said perforation, a valve in said valve-cylinder, a structure consisting of a central support and radially-arranged operating-cylinders mounted on said valve-cylinder, means for securing said structure upon said valve-cylinder, a spider-ring rotatably mounted on said supporting-ring,crankarms, connections between said arms and ring, pistons in said operating-cylinders, piston-rods pivotally connected to said connections and to said pistons, a spider-frame provided with a cylindrical extensioma tool-holder mounted in said extension, and gearing whereby the revolution of said crank-arms revolves said spider-frame. v Y

33. In a rotary drill, the combination of a casing provided With inlet and outlet openings,- one part of said casing being provided with a cylindrical extension, a spider-frame provided with a cylindrical extension which extension is located in the cylindrical extension of the casing, a tool-holder mounted in the cylindrical extension of the spider-frame, wear-plates secured to the cylindricalextensions of the spider-frame and casing, respectively,antifriction devices between said wearplates, and means for rotating said spiderframe.

34. In a rotary drill, a spider-frame composed of a base and projecting arms perforated and provided with a cylindrical extension, the outer end of which is thickened and provided with an internal and with an external screw-thread.

35. In a rotarydrll, aspider-frame consisting of a base and projecting arms, said base and arms being perforated and the perforated parts being thicker than the adjacent parts, said frame being also provided with a cylindrical extension, the outer end of which is thickened and finally reduced at the extreme end, said extension being provided with an internal and external screw-thread at the eX- treme end thereof.

36. In a rotary drill, the combination of a casing provided with inlet and outlet openings, a supporting-ring secured to said casing and provided with an eccentric perforation, a valve-cylinder mounted in said perforation, a valve mounted in said valve-cylinder, a structure comprising a central perforated su pport and radially-operating cylinders made integral therewith, said structure being mounted on said valve-cylinder, means for securing said structure upon said valve-cylinder, a spider-ring revolubly mounted on said supporting-ring, crank-arms, connections between said ring and arms, pistons in said operating-cylinders, piston-rods pivotally connected to said connections and to said pistons, a spider-frame provided with a tool-holder and operating-bearing consisting of an internal gear-ring located on said casing, a central gear-wheel mounted on said spider-frame, and gear-wheels meshing with said internal gear-ring and with said central gear-wheel.

37. In a rotary drill, the combination of a casing provided with inlet and outlet ports, a supporting-ring secured in said casing and having an eccentric perforation, a Valve-cylinder lnounted in said perforation, a valve in `said valve-cylinder, a plurality of operatingof said ring, a pipe in said casing connected with the inlet-opening and with one of the perforations in said supporting-ring, a valve in said valve-cylinder, operating-cylinders revolubly supported on said valve-cylinder, means for securing said operating-cylinders upon said Valve-cylinder, a spider-ring revolubly supported on said supportingring, crank-arms, connections between said ring and arms, pistons in said operating-cylinders, piston-rods pivotally connected to said connections and said pistons, a spider-frame provided with a tool-holder, a central gear-wheel mounted in said spider-frame and connected to said crank-arms, connecting gear-wheels mounted on arms in said spider-frame and engaging the central gear-wheel and an internal gear-wheel mounted in the casing and engaging said connectinglgear-Wheels.

39. In a rotary drill, the combination of a casing made in two parts united together with bolts and provided with inlet and outlet openings, said inlet-opening being provided with a screw-thread and a shoulder, an eccentrically-perforated ring secured to said casing, a valve-cylinder mounted in the perforation of said ring, thimbles located in said inlet-opening, a,pipe connecting said thimbles with one of the perforations iu said supporting-ring, a valve in said valve-cylinder, operating-cylinders revolubly supported on said valve-cylinder, means for securing said operating-cylinders upon said valve-cylinder, a spider-ring revolubly mounted on said supporting-ring, crank-arms, connections between said spiderring and arms, pistons in said operating-cylinders, piston-rods pivotally connected to said connections and said pistons, a spider-frame provided with a tool-holder, a central gearwheel mounted in said spider-frame and connected to said crank-arms, connecting gearwheels mounted on arms in said spider-frame and engaging the central gear-wheel, and an internal gear-wheel mounted in the casing and engaging said connecting gear-wheels.

40. In a rotary drill, the combination ofa casing made in two parts united together with bolts and provided with inlet and outlet openings, a perforated ring secured to said casing, a valve-cylinder mounted in said ring, a pipe in said casing connected with the inlet-opening, and with one of the perforations in said supporting-ring, a valve in said valve-cylinder, operating-cylinders revolubly supported IOO IIO

mounted on arms in said spider-frame and engaging the central gear-wheel, and an internal gear-wheel mounted inthe casing and engaging said connecting gear-whee1s.

In Vtestimony whereof we affix our* signatures in presence of two witnesses.

CHARLES HERMAN HAESELER. ALBERT H. TAYLOR.

Witnesses:

`E. D. PATTERSON,

A. C. GRAHAM. 

